Question

A beam of light consisting of red green and blue colours is incident on a right angled prism. The refractive index of the material of the prism for the above red, green and blue wavelengths are 1.39, 1.44 and 1.47, respectively. The prism will:

420885
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A

separate the red colour part from the green and blue colours

B

separate the blue colour part front the red and green colours

C

separateall all three colours from one another

D

not separate the three colours at all

Hard
NEET

Solution

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Correct option is A)

For total internal reflection,
Here



but   and .
Hence, green and violet will be totally internally reflected.
Red will be refracted.

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